1001211001984 has 16 divisors (see below), whose sum is σ = 1994600043270. Its totient is φ = 500605500928.

The previous prime is 1001211001951. The next prime is 1001211002009. The reversal of 1001211001984 is 4891001121001.

It can be written as a sum of positive squares in only one way, i.e., 913400718400 + 87810283584 = 955720^2 + 296328^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3910980349 + ... + 3910980604.

Almost surely, 2^{1001211001984} is an apocalyptic number.

It is an amenable number.

1001211001984 is a deficient number, since it is larger than the sum of its proper divisors (993389041286).

1001211001984 is an frugal number, since it uses more digits than its factorization.

1001211001984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7821960967 (or 7821960955 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 28.

Adding to 1001211001984 its reverse (4891001121001), we get a palindrome (5892212122985).

The spelling of 1001211001984 in words is "one trillion, one billion, two hundred eleven million, one thousand, nine hundred eighty-four".